Analysis of the spatial distribution of radiation emitted by MIR quantum cascade lasers

Pruszyńska-Karbownik, Emilia; Regiński, K.; Mroziewicz, B.; Szymański, Michał; Karbownik, Piotr; Kosiel, Kamil; Szerling, Anna

doi:10.1117/12.2009971

Cited by 4 publications

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“…The detailed construction of the assembly will be described in Ref. [15]. The transverse structure of our device is well-performed from the electromagnetic point of view.…”

Section: Resultsmentioning

confidence: 99%

Calculation of beam divergence of a quantum cascade laser by effective index method

et al. 2013

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Quantum cascade lasers (QCL's) have proven their usefulness as light sources in many applications, like remote gas sensing, molecular spectroscopy or free-space communication. In most cases the high-quality low-divergence beam is desired. This work presents the theoretical analysis of QCL's beam divergence. The electromagnetic field in the resonator is calculated according to effective index method. Theoretical results are compared with measurements.Keywords: quantum cascade laser, effective index method, beam divergence, far-field pattern.

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“…The detailed construction of the assembly will be described in Ref. [15]. The transverse structure of our device is well-performed from the electromagnetic point of view.…”

Section: Resultsmentioning

confidence: 99%

Calculation of beam divergence of a quantum cascade laser by effective index method

et al. 2013

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“…Detailed information about the technology can be found in Kosiel et al (2009), Karbownik et al (2014), Bugajski et al (2014). All measurements were provided by using a goniometric profilometer (Pruszyńska- Karbownik et al 2013). On the basis of two-dimensional (2D) power distributions, we calculated distributions in direction parallel to the epitaxial layers (slow axis) by summation over perpendicular direction (fast axis).…”

Section: Methodsmentioning

confidence: 99%

A novel method to calculate a near field of widely divergent laser beams

2016

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A new method to calculate the near field of widely divergent laser beams based on a given far field is proposed. It is assumed that the field of radiation consists of several transversal modes and the far field is determined by the Huygens principle. The idea consists in employing the least squares method to find a minimum of the difference between the measured far field and the far field calculated under the assumption that is consists of several transversal modes with assumed weights. To find this minimum the Levenberg-Marquardt algorithm is used. Thus the problem is dealt beyond the paraxial approximation. The method is illustrated by its results for experimental mid-infrared quantum cascade laser beams and for the beams obtained by simulations. Keywords Near field Á Far field Á Quantum cascade laser Á Non-Gaussian beam This article is part of the Topical Collection on Advances in the Science of Light.

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“…The power distribution of the laser beam in the far field was measured in room temperature by using a goniometric profiler (Pruszyńska- Karbownik et al 2013Karbownik et al , 2015. The laser was supplied with 100 ns pulses, frequency of 500 Hz, and current of 1.2 times threshold.…”

Section: Methodsmentioning

confidence: 99%

Field distribution in waveguide of mid-infrared strain-compensated InAlAs/InGaAs/InP quantum cascade laser

et al. 2017

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In this paper we present calculated mode distributions in double-trench mesa waveguide of a quantum cascade laser (QCL) and far-field distributions of the QCL beam-both calculated and experimental. We have computed electric field distribution in the waveguide, confinement factor and mode absorption for different transversal modes and far-field distributions based on them. The parameters of the modes were calculated for various sizes: width and length, of the QCL waveguide. The maximal mesa width for single-transverse-mode operation was determined to be about 0.7 times wavelength. This value and the mode discrimination depend only slightly on the resonator length. To verify experimentally the results of the simulations we have measured power distribution in the far field by using goniometric profiler. The measured distribution agrees well with the results of the numerical calculations.

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Analysis of the spatial distribution of radiation emitted by MIR quantum cascade lasers

Cited by 4 publications

References 3 publications

Calculation of beam divergence of a quantum cascade laser by effective index method

Calculation of beam divergence of a quantum cascade laser by effective index method

A novel method to calculate a near field of widely divergent laser beams

Field distribution in waveguide of mid-infrared strain-compensated InAlAs/InGaAs/InP quantum cascade laser

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